Papanastassiou, D. A. and Wasserburg, G. J.
(1974)
Evidence for late formation and young metamorphism in the Achondrite Nakhla.
Geophysical Research Letters, 1
(1).
pp. 23-26.
ISSN 0094-8276.
doi:10.1029/GL001i001p00023.
https://resolver.caltech.edu/CaltechAUTHORS:20141111-143331808
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Abstract
We have determined an age T=1.37 AE for Nakhla and an initial ^(87)Sr/^(86)Sr, I = 0.7023. A rather thorough Sr equilibration took place at this time between all the phases of this meteorite, but there is clear evidence of somewhat incomplete isotopic equilibrium during the 1.37 AE event, which is not consistent with the derivation of Nakhla from a magma at this time. Nakhla has a young model age of 3.6-2.9 AE which requires that gross differentiation processes for its parent body occur between 3.6 and 1.37 AE, significantly later than 4.6 AE. The most reasonable model is that Nakhla formed as an igneous rock at ∼3 AE and was metamorphosed at 1.37 AE. Several similarities exist between the Nakhla parent planet and the Earth and indicate the existence of other objects with close terrestrial chemical affinities.
| Item Type: | Article |
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| Additional Information: | Copyright © 1974 by the American Geophysical Union.
(Received April 15, 1974; accepted April 24, 1974.)
The sample from the Harvard collection was provided through the generous courtesy of Professor C. Frondel with prompting from Judith Frondel. We thank R. A. Schmitt for stimulating our interest in Nakhla in a Mexican restaurant and for providing us with a sample. A. L. Albee provided incisive comments at a critical stage of this paper. This work was supported by the National Science Foundation, Grant GP 28027. |
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| Funders: | | Funding Agency | Grant Number |
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| NSF | GP 28027 |
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| Other Numbering System: | | Other Numbering System Name | Other Numbering System ID |
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| Caltech Division of Geological and Planetary Sciences | 2476 |
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| Issue or Number: | 1 |
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| DOI: | 10.1029/GL001i001p00023 |
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| Record Number: | CaltechAUTHORS:20141111-143331808 |
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| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20141111-143331808 |
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| Official Citation: | (1974), Evidence for late formation and young metamorphism in the Achondrite Nakhla. Geophysical Research Letters, 1: 23–26. doi: 10.1029/GL001i001p00023 |
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| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. |
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| ID Code: | 51599 |
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| Collection: | CaltechAUTHORS |
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| Deposited By: |
George Porter
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| Deposited On: | 11 Nov 2014 23:04 |
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| Last Modified: | 10 Nov 2021 19:13 |
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